Parker Nitrile Buna-N (NBR) O-Rings

Parker Nitrile Buna-N (NBR) O-Rings Material Description:

Parker nitrile Buna-N (NBR) o-rings are one of the most common and widely used sealing materials because of its excellent sealing and mechanical properties at a low cost. Nitrile rubber (NBR) is the general term for acrylonitrile butadiene copolymer. The acrylonitrile content of nitrile sealing compounds varies considerably (18% to 50%) and influences the physical properties of the finished material. The higher the acrylonitrile content, the better the resistance to oil and fuel. At the same time, elasticity and resistance to compression set is adversely affected. In view of these opposing realities, a compromise is often drawn, and a medium acrylonitrile content selected. NBR has good mechanical properties when compared with other elastomers and high wear resistance. NBR is not resistant to weathering and ozone.

Parker O-Ring Distributor

For over 50 years, Engineered Seal Products has partnered with Parker Seals. ESP is proud to be one of the FEW Premier Distributors to qualify as a "Parker Seal Technology Center (STC)".

What does Parker STC mean?

Proven Engineering Capability
Expert Material & Technical Support
ISO Quality Approval
Strong Financial Track Record

General NBR Information Freudenberg NBR Compounds

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Parker Nitrile Buna-N (NBR) Chemical Resistance:

Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils) vegetable and mineral oils and greases.
HFA, HFB and HFC hydraulic fluids.
Dilute acids, alkali and salt solutions at low temperatures.
Water (special compounds up to 100°C) (212°F)

Parker Nitrile Buna-N (NBR) Not Compatible With:

Fuels of high aromatic content (for flex fuels a special compound must be used).
Aromatic hydrocarbons (benzene).
Chlorinated hydrocarbons (trichloroethylene).
Polar solvents (ketone, acetone, acetic acid, ethylene-ester).
Strong acids.
Brake fluid with glycol base.
Ozone, weather and atmospheric aging.

Parker Nitrile Buna-N (NBR) O-Rings Compound Numbering System:

Parker has two type of nomenclature used to reference Nitrile Buna-N (NBR) products.

N
Polymer Code (Single Letter)

0674
Sequence Number (Four Digits)

-70
Durometer Indicator (Two Digits)

- OR -

N
Polymer Code (Single Letter)

M
Special Property Description (Single Letter)

506
Sequence Number (Three Letters)

-65
Durometer Indicator (Two Digits)

Special Property Descriptions:

General Purpose

Low Compression Set

Ethylene Acrylate or (Vamac®)

Fuel Resistant or Fully Fluorinated

Higher Fluorine Content

NSF/FDA/WRAS Approvals

Internally Lubed

Mil/AMS Specifications

Low Temperature Flexible

Non-Black Compound

Carboxylated

Parker Nitrile Buna-N (NBR) O-Rings Compounds:

Parker Compound Number	Hardness (Shore A)	Low Temp	High Temp	Color	Recommended For
N0545-40	40 +- 5	-45	225	Black	AMS 3201
N0299-50	50 +- 5	-55	225	Black	AMS 3205, UL listed
NL151-50 (8315)	50 +- 5	-55	225	Black	Internally Lubed
N0406-60	60 +- 5	-40	225	Black	General Purpose
N0525-60	60 +- 5	-25	250	Black	AMS 3212, AMS 3220
NM506-65	65 +- 5	-70	180	Black	AMS 7271
N0103-70	70 +- 5	-55	225	Black	Low Temp.
N0287-70	70 +- 5	-35	250	Black	Synthetic Lubricant, Resistant, AMS 7272
N0497-70	70 +- 5	-35	212	Black	Low Swell, SAE 120R1 CL ll, UL listed
N0602-70	70 +- 5	-70	180	Black	General Purpose, AMS-P-5315, Low Temp.
N0674-70	70 +- 5	-30	250	Black	General Purpose, MIL-G-21569, Cl I, UL listed
N0757-70	70 +- 5	-30	225	Black	NSF 61, UL Listed
N0818-70	70 +- 5	-30	250	Black	Internally Lubed
N1069-70	70 +- 5	-30	180	Black	FDA
N1220-70	70 +- 5	-30	225	Black	NSF 51, FDA
N1470-70	70 +- 5	-40	250	Black	General Purpose, X-rings
N1471-70	70 +- 5	-40	250	Black	General Purpose
N1499-70	70 +- 5	-30	250	Black	General Purpose, UL
N1510-70	70 +- 5	-30	225	Black	NSF 61
N1527-70	70 +- 5	-30	225	Black	UL Listed
NM071-70	70 +- 5	-60	180	Black	AMS-R-7362
NW163-75 (40601)	75 +- 5	-30	225	Rust	Internally Lubed
N0508-75	75 +- 5	-30	180	Black	FDA, USDA
N0756-75	-75 +- 5	-65	250/275	Black	AMS-P-83461
N0951-75	75 +- 5	-25	275	Black	How Temp, Low Compression Set
N1500-75	75 +- 5	-35	212	Black	Low Swell, UL Listed, Fuel applications
NM304-75	75 +- 5	-65	225/250	Black	MIL-DTL-25732
N0750-80	80 +- 5	-25	250	Black	Carboxylated
NA155-80	80 +- 5	-25	250	Black	General Purpose
N1090-85	85 +- 5	-25	225	Black	"ELF" Pneumatic, Carboxylated, Internally Lubed
N0300-90	90 +- 5	-40	180	Black	Back Up Rings
N0507-90	90 +- 5	-65	180	Black	AMS-P-5510, Low Temp.
N0552-90	90 +- 5	-30	250	Black	General Purpose
N0702-90	90 +- 5	-30	275	Black	Low Compression Set
N1059-90	90 +- 5	-30	275	Black	Low Compression Set
N1444-90	90 +- 5	-30	250	Black	Parbaks only
N1490-90	90 +- 5	-30	250	Black	General Purpose
NB194-90	90 +- 5	-30	250	Black	Low Extrusion Set, Extrusion Resistant

ASTM Designation
NBR

Shelf Life
15 Years

Hardness (Shore A) Range
40 - 90

Try Out O-Ring Shelf Life Calculator

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.

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